The upper contact arm on this horn has been processed with 840ºC oil quenching, which makes the upper contact arm not easy to distort. The below contact arm is made with stainless steel that has been heat treated with 260ºC for 2 hours, which makes the below contact arm easy to compose forces. After the two contact arms assembled, they have been treated with 80ºC heat preservation for 2 hours to dispel the stress produced by assembling the contact arms. Then, the assembly may be used more than 50000 times and the horn volume may be over 105.dB. Meanwhile, the assembly has been tested with the 7th level or above. The inner horn has been equipped with waterproof ring while its surface has been gelatinized to ensure water proof and damp proof.

2.OUR SERVICE:1. Payment:We accept L/C, T/T, Western Union, or other payment.2. Delivery:Normally we will deliver the goods within 20-25 days after the receipt of the above payment.3. Shipment:Generally for order below 10 cartons, we'd choose express such DHL, TNT, EMS and so on,it will take 4-5 days to reach you. Also we can ship by air or by sea, it depend on customer's choice.4. Sample:We can send you sample for checking our quality, you need pay sample fee and express fee, we will refund you once you place bulk order to us, this is to show the sincerity of business cooperation.Advantage: Good package, Competitive Price, Fast ShipmentRemarks: All of parts can be customized.